Got HTTP status 404 Not Found for "http://roaringjelly.org/~jc/music/book/Book26/dim.abc"
pngcmd="(./ps2png 512 512 /Users/jc/w/tmp/Tune-64830-dim.ps) >>/Users/jc/w/tmp/Tune-64830-get.log 2>&1" returned status 256
http://roaringjelly.org/~jc/music/book/Book26/dim.abc

Error exit status 256; here are some files to check:
[P=tuneget V=1/1 B=0 scale=0.70 512x512 PNG]
filesizedescription
Tune-64830-10851_Paddy_Whack.abc 509 ABC music file with the extracted tune(s)
Tune-64830-10851_Paddy_Whack.txt 509 Plain-text file with the extracted tune(s)
Tune-64830-Master_Fox_Maules_Birthday.abc 536 ABC music file with the extracted tune(s)
Tune-64830-Master_Fox_Maules_Birthday.ps 35913 PostScript
Tune-64830-Master_Fox_Maules_Birthday.txt 536 Plain-text file with the extracted tune(s)
Tune-64830-dim.abc 142 ABC music file with the extracted tune(s)
Tune-64830-dim.ps 6 PostScript
Tune-64830-dim.txt 142 Plain-text file with the extracted tune(s)
Tune-64830-get.log 13543 Log file, useful mostly for debugging
These files should be available for 24 hours.